[Elecraft] RTTY Mode Filter Settings for PSK31 (Correction)

[DAVID POWELL]

[I see that in my original message I had typed a couple of the BFO =
frequencies wrong, so I'm trying again.]

I am experimenting with filter settings in the RTTY/Data Mode (r bar) =
=3D
for use with PSK 31.

My objective is to prevent a strong signal at one end of the waterfall =
=3D
display from activating the receiver AGC to the extent that I can't copy =
=3D
a weak signal at the other end of the waterfall.

My approach is to configure the four "r bar" filter bandwidth and BFO =
=3D
settings to provide one setting that covers the full waterfall bandwidth =
=3D
(about 350 to 2400 Hz) then three settings that each cover the waterfall =
=3D
in overlapping segments. My initial filter settings are as follows:

FL1:  OP1 bandwidth, BF1 at 4916.30 kHz (covers entire waterfall)
FL2:  1.20 kHz, BF2 at 4914.67 kHz (covers lower third)
FL3:  1.20 kHz, BF3 at 4915.39kHz (covers middle third)
FL4:  1.20 kHz, BF4 at 4916.10 kHz (covers upper third)

These settings were "eyeball" optimized using "Spectrogram" and the =3D
waterfall on "WinPSKse" and seem to work pretty well.

Has anyone else experimented with filter settings for PSK31? What =3D
suggestions do you have for improving these settings?

David Powell, NM5U
Los Alamos, NM


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